61717764 has 12 divisors (see below), whose sum is σ = 144008144. Its totient is φ = 20572584.

The previous prime is 61717759. The next prime is 61717783. The reversal of 61717764 is 46771716.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2571562 + ... + 2571585.

Almost surely, 2^61717764 is an apocalyptic number.

It is an amenable number.

61717764 is an abundant number, since it is smaller than the sum of its proper divisors (82290380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61717764 is a wasteful number, since it uses less digits than its factorization.

61717764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5143154 (or 5143152 counting only the distinct ones).

The product of its digits is 49392, while the sum is 39.

The square root of 61717764 is about 7856.0654274261. The cubic root of 61717764 is about 395.1876777316.

It can be divided in two parts, 61717 and 764, that added together give a triangular number (62481 = T₃₅₃).

The spelling of 61717764 in words is "sixty-one million, seven hundred seventeen thousand, seven hundred sixty-four".